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Simplifying 45 + -1r = 45 + -4r Add '-45' to each side of the equation. 45 + -45 + -1r = 45 + -45 + -4r Combine like terms: 45 + -45 = 0 0 + -1r = 45 + -45 + -4r -1r = 45 + -45 + -4r Combine like terms: 45 + -45 = 0 -1r = 0 + -4r -1r = -4r Solving -1r = -4r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '4r' to each side of the equation. -1r + 4r = -4r + 4r Combine like terms: -1r + 4r = 3r 3r = -4r + 4r Combine like terms: -4r + 4r = 0 3r = 0 Divide each side by '3'. r = 0 Simplifying r = 0
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